1999 AX21

1999AX21, 17876, 1971 DR1, 1971DR1, 1978 EA8, 1978EA8, J71D01R, J78E08A, J99A21X

All data for this body: [vot]

MPC data
Name (number) 1999 AX21 (17876)
a 2.31300
e 0.07048
i / sin(i) 4.4778 / 0.07807
q 2.14997
Q 2.47602
ω 325.6948
Node 278.4249
m 260.3836
n 0.2802
Epoch 2460200.5
nobs 2440
nopp 20
Years observed 1971-2023
rms 0.61
Best values
[raw, vot]

Value Standard error
Parent
 
ap 2.314
ep 0.085
sin(ip) 0.089
Value Standard error
G 0.150
H 14.730
Mass
D 8.18 0.028
pV 0.048 0.0043
Proper elements data
[raw, vot]

ap ep sin(ip) Author Reference Method
2.3136 0.0853 0.0891 Novakovic_Radovic_Todovic 2003A&A...403.1165K Numeric-Oct-2022
Diameter data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
6.50 1.960 1.960 Masiero 2021PSJ.....2..162M NEATM
7.32 2.380 2.380 Nugent 2016AJ....152...63N NEATM
7.33 1.980 1.980 Masiero 2020PSJ.....1....5M NEATM
7.85 2.950 2.950 Masiero 2020PSJ.....1....5M NEATM
7.91 0.033 0.033 Masiero 2011ApJ...741...68M NEATM
8.01 2.280 2.280 Masiero 2020PSJ.....1....5M NEATM
8.81 0.051 0.051 Masiero 2011ApJ...741...68M NEATM
8.83 2.000 2.000 Masiero 2020PSJ.....1....5M NEATM
Albedo data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.040 0.0400 0.0400 Nugent 2016AJ....152...63N NEATM
0.044 0.0066 0.0066 Masiero 2011ApJ...741...68M NEATM
0.044 0.0370 0.0370 Masiero 2020PSJ.....1....5M NEATM
0.045 0.0360 0.0360 Masiero 2020PSJ.....1....5M NEATM
0.045 0.0660 0.0660 Masiero 2020PSJ.....1....5M NEATM
0.051 0.0310 0.0310 Masiero 2020PSJ.....1....5M NEATM
0.052 0.0060 0.0060 Masiero 2011ApJ...741...68M NEATM
0.063 0.0330 0.0680 Masiero 2021PSJ.....2..162M NEATM
G data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
0.15 MPC-2023-12-94 MPC-2023-12-94 Phot
H data
[raw, vot]

Value Uncertainty up Uncertainty down Author Reference Method
14.73 MPC-2023-12-04 MPC-2023-12-04 Phot